10 Aug
2015
10 Aug
'15
4:41 p.m.
The battery in the teletype DMD 5620 is mounted in a very fatal position,
and does indeed leak, as I learned this weekend.
If you have not removed it, I would get on that now.
In fact, if you still have batteries in anything, you might be doing it
wrong... ;)
Cheers,
- Ian
--
Ian Finder
(206) 395-MIPS
ian.finder at gmail.com
10 Aug
10 Aug
8:48 p.m.
On Mon, Aug 10, 2015 at 4:41 PM, Ian Finder <ian.finder at gmail.com> wrote:
The battery in the teletype DMD 5620 is mounted in a
very fatal position,
and does indeed leak, as I learned this weekend.
Ow!
If you have not removed it, I would get on that now.
Thanks for the tip. I just checked the Blit I received this summer,
and the battery is thankfully intact. Zero voltage, but no leaks
(yet).
In fact, if you still have batteries in anything, you
might be doing it
wrong... ;)
I lost an A4000 because I _thought_ I pulled the battery, but I was
wrong. :-( It might be fixable, and I will try, but I'm expecting to
have to replace it.
Now I just need to find out why this Blit doesn't display anything
when I power it on. The motherboard seems typical of AT&T products -
a massive grid of square-pad-vias and a number of
proprietary/private-label ICs. The firmware is on 8 27128s. In case
I might have bitrot in 30-year-old EPROMs, does anyone have backups of
the firmware I can test/reburn with? The RAM is 1MB of soldered
Hitachi 50256s. Probably OK but no easy way to test them.
-ethan
9:32 p.m.
On Mon, Aug 10, 2015 at 8:48 PM, Ethan Dicks <ethan.dicks at gmail.com> wrote:
On Mon, Aug 10, 2015 at 4:41 PM, Ian Finder
<ian.finder at gmail.com> wrote:
Ah ha! Pulling the dead battery has brought the Blit back to life.
It passes self-tests and now is screaming "WAITING FOR KEYBOARD
STATUS".
Back to the search for a compatible keyboard. Two, really, since I
also have a 730+ that needs one.
-ethan
The battery in the teletype DMD 5620 is mounted
in a very fatal position,
and does indeed leak, as I learned this weekend.
Now I just need to find out why this Blit doesn't display anything
when I power it on... 
9:38 p.m.
Dang Ethan! What Ian said! Get 'em out rtfn!
On Mon, Aug 10, 2015 at 9:32 PM, Ethan Dicks <ethan.dicks at gmail.com> wrote:
On Mon, Aug 10, 2015 at 8:48 PM, Ethan Dicks
<ethan.dicks at gmail.com>
wrote:
Ah ha! Pulling the dead battery has brought the Blit back to life.
It passes self-tests and now is screaming "WAITING FOR KEYBOARD
STATUS".
Back to the search for a compatible keyboard. Two, really, since I
also have a 730+ that needs one.
-ethan
On Mon, Aug 10, 2015 at 4:41 PM, Ian Finder
<ian.finder at gmail.com>
wrote:
> The battery in the teletype DMD 5620 is
mounted in a very fatal
position,
and does
indeed leak, as I learned this weekend.
Now I just need to find out why this Blit doesn't display anything
when I power it on...
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